Refrigerating apparatus.



0. E. BORNHAUSER.

REFRIGERATING APPARATUS.

APPLICATION men ms. 19. um.

3 swim-mm? 1.

0. 'E. BORNHAUSEH. REFRIGERATlN-G APPARATUS. aPPuc/umqa mm ma. 19. um.

Patented Feb, 5,1918

3 SHEETS-SHE-ET 3.

WITNESSES ATTORNEY llhllll srarns or i lit ifil UTEG E. BORNHAUSER, F SAMDUSKY, OHM), AfifiiIGNOR 0E" ONE-THERE) 1M9 JOEE E. HERMAN AND tDJi SE;THKRD TO CHARLES L. WAGNER, 3015K 015 SAHDWSIKY, UHIG.

'ZRZEFBEGTERATING APPAKMQJJJ'UB.

Specification e12 Letters intent.

Patented Feb. 5i,

- Application filed February 19, 3917. tle'riel No. teams.

- ating apparatus of theintermittent ahsor tion t pc in which the same liquid container, usual y termed generator-absorber, acts alv ternately as a generator and as an'ubsorber;

and its object is to provide an apparatus of this character, which may beeconomically constructed and operated and is susceptible of manufacture in large or small units, and is especially applicable for private installation as well as being adapted for large installations.

in accordance with the invention ammonia Water is heated in a.- suitable container or generator-absorber to drive off the ammonim gas, which, carrying more or less water in the shape of vapor, is preliminarily cooled to condense the watery vapor, so that the ammonia becomes dried or free from Water. The dry is chilled under pressure to condense it to liquid form and is conducted to a container through check valves, so that the condensed 0r liquefied gas cannot return to the genorator-absorber when the latter becomes cooled. in the liquefied our monio receiver, float mechanism is installed and is arranged to control the flow of the hen F '1 agent, usually gas, which is employed to'heat the ammonia water or aqua ammonia in the preliminary driving ofi of the ammonia gas therefrom. When a determined supplyof liquid ammonia has ac; cumulated in the receiver, it is permitted to pass to an expansion chamber, where by expension a chilling etlect is produced to be utilized for refrigerating purposes. The expended ammonia then finds its Way back to, the generator-absorber to be reabsorbed by the Water therein.

When the supply of liquefied ammonia becomes low the heating agent is again turned on, and by means of a pilot flame is ignited, whereupon the distilling of the ammonia gas and the chilling and accumulation thereof for further utilization for refrigerating pnI-- poses is caused.

Such cycle of operations. proceed indetinitelyand is entirely automatic in action.

I the accompanying The refrigerating chamber is also provided with a float and devices controlled thereby for determinin the flow or the ammonia into the refrigerating chamber, v

The invention will be best understood from a consideration of the following de: tailed description, taken in connection with drawings forming part of this specification, with the further understanding that while the drawings show a practical form of the invention, the letter is not confined to any strict conformity with the showing of the drawings, be changed and modified changes and modifications come Wltllilllillfi sco e of the appended claims.

n the-drawings; Figure 1 is a vertical diametric section with some parts in elevation, showing the heating and, condensing; mechanism, and parts associated therewith. Fig. 2 is an elevation of the structure of 'liig. 1 viewed from the left l and side thereof and showing the receiver ror'contaiuing liquid ammohiayin vertical cliametric sec tion, such receiver being hiddenin Fig. l.

Fig. 3 is a more or less schematic section but may of a refrigerator with the refrigerating] chamber, associated with the structure of Figs. 1 and 2, installed therein.

Fig. at is a section on a larger scale than Fig. 3 and illustrating in detail a portion of so long as such the refrigerating chamber and fioat located therein. v 7

Figs. 5 to 13, inclusive, are views some in elevation" and some in section, of various dc tails of construction of the apparatus Referring to the drawings, there-is shown a generatorabsorber casing 1, usually though not necessarily of elongated cylin- (lricnl form and mounted in an upright posi-v tion upon a base 2. Locatecl within the base 2 at a low point is a burner which may be considered as of a type permitting the use of gas as a fuel, and associated with the burner loo 3 is a small burner e for a pilot flame. The burnerv 3 is supplied with fuel, usually gas,

, througha pipe 5, which'in the construction shown rises along the casing l and includes valves 6 and 7 to be herelnatter referred to.

Within the base 2 and above the burner 3 are coils 8 of pipe having a connection 9 opening into the interior of the casing 1 th ough.

the bottom thereof, and the coils 8 are promded with contmuations l0 about the lower I portion of the same above the base 2 and ultimately opening, as indicated at 11, into exterior thereof. The casing 1 when inop eration contains a body 16 of ammonia water (aqua ammonia) I rising to a level above the top of the coil I In order that the relative d mensions of I the parts may be more orless appreciated,

it ma 7 be stated that in an actual construc tion t e depth of the liquid 16 is about four-' teen inches, but such dimensions may be departed from to a considerable extent without affecting the invention, the size of the plant very largely determining dimensions.

' The casing 1 rises to a considerable height above the level of the liquid 16 and within such portion of the casing is a separator for condensing and separating out the entrained water, from the ammonia vapor or gas, consisting in the present instance, of bafiles 17 Iand coils 13 of piping, such coils 18 being connected in series by a pipe 19 and having terminal portions 20, 21, respectively, leading through the casing 1 to the exterior thereof.

' Mounted on top of the casing isa water ja cketed condenser coil 22 comprising piping 23 hnd a sheathing 24:, the latter being in spiged relation to and inclosing the piping 2 ,so' as to provide a passage way 25 constituting a duct for water',-the piping 23 being designed to conduct ammonia. 4

Near the top of the casing 1 there is branched 0d a pipe 26 connecting through to, another pipe28, which a check valve 2 latter is in'turn connected to a check valve 29 leading-to one end of the pipe 23, such being the upper end of the pipe 23 in the installation shown in the drawings. The end 20 of the-coils 18 is connected to the ps "athing 24 so as to open into the duct 25 between the sheathing 24 and the pipe 23.

1 The pipe 28 is continuedon the side of the check valve 27 remote fromithe check valve 29 to another check yalve 30, which latter is connected by a pipe'i31 to the interior of the casing 1 at a point below the level of the liquid 16 so as to discharge into the liq-' old to conduct thereto any dripp ings or leakage which may occur.

Mounted on a bracket 32 or other support secured to one side of the casinp- 1 is another casing 33 designed to receive theliquid ammonia. from the condenser, which may be considerably smaller than/the casing 1' and contains acoil of pipe 34;, the latter being connected at its upper end by a pipe memes nected by a link 40t0 a lever 41 in turn connected to a rock shaft 42 shown in Figs. 2

and 7. The rock shaft 42 is mounted in .a

sleeve 43 made fast toand projectin through one wall of the casing 33 near t e upper end of the casing, such mountin of the shaft 42 preventing leakage, but at t 1e same time permitting rockin of the shaft and the attachment of certain structures to the shaft exterior to the casing ,33. Outside of the casing 33 the shaft 42 carries a collar 44 with I divergent arms 45 each carrying at the free" end an adjustable set screw 46, as shown in Figs. 1, 2, 7 On the shaft 42 is a weighted lever l7, 48,49, of the firstorder mounted between its two ends on the shaft and free to rock thereon. The upper arm 47. of the lever which carries the weight 49, is provided with a laterally projecting pin 50, to engage the elongated eye of the connecting rod 51, the other end of which is jointed to the crank arm 52, onone end of the rock shaft 53, mounted in suitable bearings in the supporting bracket secured to the casing 1; on the other end of said rock shaft is another upwardly extending radial arm 61,

which rocks with shaft 53, said rocking motion being limited'by properly located stops.

'61", 61, on the bracket 60 between which,

the arm 61 vibrates. To the free extremity of the radial arm 61, is connected, by a chain or other flexible coupling 61 a rod 61 which extends down through a stand pipe or guide tube 62, and couplings 63, 64 included in said tube, to a valve casing? 65 shown separately in Fig. 12, inclosing a moi able valve member 66, to which rod 61 is connected. ,The valve casing 65 discharges into a waste pipe 67 which may lead to-any suitable point of disposal. l

The lever arm 48 carries at its outer end a laterally projecting pin 54, which extends throu h an eye 54 at one end-of a rod 55 exten ing through a stufiing 130x56 in the gas valve 7, the latter being shown in detail in Fig. 13. The valve 7 is a check valve having a movable valve member 57 assomated with a valve seat 58. The valve member 57 is'in' the path of the rod 55 which enters the valve'7 throughthe stuffing box 56.

When the'shaft 42' is rocked in one direction one of the set screws 46 on a correspondin arm 45 engages the upper arm 47,

"lzioo lo ciibcr pcrmil; is

' mooooo lzlic orm all is im pcllcel by ilic ivoigglil ell lo aosomo the opposite tilled posilbflorl, loo ro. movci'ocoi: of tho arm ll llic pin Within may be somewhat T9 1}. 555 in a (limovolvc member 5? :ic or lo lorcc lloio volvc member to lhc chory which lclilcr cloogolcd, lo ocliuilc loo opcu pooition, in occorcloocc with the clirco,

ill'l lion oi: movcmcoi oil "llac arm 47. lo the poisiiioo of the arm l? shown in Fig. 2 the volvc mcmbcr 57 is in the open position, the

member 68 is oponcei, cooling water may has been o.

volvc to the pig-c 36 lioot being lowcrcrl. When the float 39 io Z'fillllifll the rock shall; is propelled in a rlirecciou to cause lilac arm l? to move from. i

lilo position shown in Fig, 2 to the o'pposmcl jbooilzioo of lilting, causing lhc closure of valve mci'nbcr 5?,Wl1crcfore wlicn llici'e cccumulofiion of liquid in a manner lo be dcccribccl Within. the casing 3? siuilicicnl: lo lifl; the loot 39 to an cxlcnl causing lilo cloourc oi? the valve member 5?;

Foo passage of through the pipe 5 io col; oil all this volvc 3. When the, float ll. lowers to on cxtcnl; to rctorii the arm ll" to bloc first posilion, loo valve mcmhci-BT is moved to the opcn position, and hence gals mcy ogoiu llowlhrough tho burncr 3 provided it is not o'llicrwisc cut oil. Under some circumslzimcco the flow of gusto the burner is cut all cl; lihc valve 6, which is a member of on cmerg-geiicy or safety automatic cur-oil of thermally controlled, type locoicrl at chil point, as will be hereinafter more fully cicocribeil ill; will be notcdl that whenever ilic gas vclvc l is coco-in "whichpooitioo it shown in Fig} 2-itl1e vvotcr valve is alsov open as shown in she came figure; and whencvcr the gas volvc '7 io the water Volvo 35 will be closed also. 'lbc objcct ol' the concurrent opening and closing of these two volvcs will be preocnlaly explained.

Tlll'io valve 37 which controls the supply of vvalcr to live oppomlus is shown separately in Fig Til tho casing of this valvciocloses a movable Volvo member '68 lll'glltl toward llZ-S scoot by'c spring 69. Engaging lizbo mcmbcr F68 is o rocl entering the volvc casing from the exterior and umlcr control of-o lcvcr *(l carried by o brockcl on lhe coiling l. The lcvcr 7'! is in turn under tho control of" a thermostat 73 lOCHlt'll "Within ll'ic casing 1 in position to be im mcrsecl in the liquid 16, so that the volvc 6,8 is'l'orcc l opcn'vvlicn the liquid '10 is llfi ilflol to a predetermined extent, and is ollovvcrl to close under the action of tho spring 69 when the liquid 16 is cooled boovv predetermined dogircc. llfllcn thc voh'c lloiv through the ilipcfii? by waybf lilo lhcuco through the coil ill, and by way o. the pipc to the rlucl 25 lccvlog; lzlio lollcr by may of lilo oicmbcr 7'8 in the open position.

A branch pipe ll from a coupling 63 on the stood pipe or guide tube 62 connects the cooling coil 13 in the gerieratorobsorbcr with the water supply system at a point llQ- yoncl the valve 65 relatively to the direction of zrovcl of the entering water. When ihe Volvo 65 is open, as shown in. Fig. 2 and in full lines in Fig. 8, (which is when the gcncratorobsorber is acting as a gcucrclor) tho coil 13 is cub out of the Water circulating cyslzem, the water circuit in such case hciug from the Water supply pipe 36 through the coil. 34, the Water jacketed condenser coil 22, and the separator coils.- 18 successively, to tho coupling 6-1, and thence directly through the open valve 65, to discharge outlet 6'2. When however the valve 65 is closed, as shown in clottcdl lines in li ig. 8 (which is when the gcnerator-absorber is acting as on absorber) access to the outlet 67 is cut oil, and lhcvval'cr consequently passes up through thc'sland pipe 62, to (coupling (-33 and thence by branch 14 to cooling coil 13, through which it passes, discharging oil").- Thus .lbc cooling coil 13 in the gene] itorabsorber, is in a by-pass from tho woler circulating system, which by-pnss is thrown into or out of circuit Witlllbiit system according as the generator-absorber is acting as an absorber or as a generator.

The automatic safety gas cut-off of thermally controlled type, may be of any of the known forms of such cut-oil's used for various purposes in the industrial arts. But as in my apparatus it is used only as an vemergency or safety clcvicc to operate only in case of dangerous or abnormally high precsurcs in the generator-absorber, and as m such casclhe excess of pressure is genorally '(iuc to causes which demand the personal attention of the operator, I prefer to so organize and arrange the parts of tho dcvicc that lube vulvc when once closed rcmoins closed until it is manually reset even though in the meantime the pressure bholl have been reduced below the (longer line, thus compelling the attendanc and attention of the opcratorbcforc the op umitus con again start. A device having l'hls cluu-- actcristic is illustrctccl in Figs. 1, 2,5, 6.

The spoce'within tho gencratorobsorber casino; 1 obovc the level of the liquid 16 is connected to a Bourrlon' tube 74: in turn con uccl'crl by a link 75 to o gravity rock arm 76 carried by the valve 6. In the path of the gravity rock arm T6 is an arm 77 fast to a movable valve member 78 within the valve 6. The arm 771s under the normal control of a spring Z9 tending to hold the valve- When, however, the Bourcloo tubc i l is octucleii to on extent to push lbc arm ill beyond the con Lilli ter of gravity, it will fall upon the arm 77,

and overcoming the spring 79 close the valve member 78, thus shutting the supply, of

as to the'bur'ner3, even though the valve be in the open position. When the weighted arm 77 once falls it remains in that fallen position until raised and reset: by I hand." When the arm 77 is thus raised, the

valve 78, being relieved of the superior weight of the said arm, is free toopen. The

\ B'ourdon tube 74 is to be taken as an example of any suitable means whereby abnormal pressure within. the casing 1 will cause the closing 'otthev valve 78.

The "products of combustion fromthe burner 3 after passing through any-suitable communicating duct (not. shown) from the interiorof the base 2 into the sheath 12 find "escape through ajflue .80 to a chimney or 10., V The valve 29 comprises 'a casin enteredat one end by the pipe 28 and. at t e other end. by afplug 81. he pipe 28' rises into the valve! 29' for a. considerable distanceand abovepipe 23. The ping 81 contains a.

movable valve member 82 having a reduced end 83 entering thenpper end of the pipe 28 so; as to close the latter againstfiuids tending to enter the casing 29 through-the pipe 23. In this way,.,fluids may-enter the check valve through the pipe 28 and escape through the pipe 23, but cannot flow in the return directm v In Fig. 3 there is shown more or less schematically a refrigerator 84 such as may i and may represent any approved type of be" used in households or in hotels or the like,

refrigerator for the purpose. It is customary in suchrefrigerators to have an ice chamber 85, and such ice chamber maybe utilizedfor refrigerating purposes by having therein certam'devices whereby the refrigerating structure'of Fi' s. 1 and 2 may be employed. Within the c amber 85 there i tacle i is located a casing 86 provided with a bottom member 87 through which there extends a nip lo 88 bored out to provide a recep r a'valve 89 urged toseat toward t e casin 86 by a spring 90 within the nipple The valve 89 is provided with a stem 91' rising into the casing 86 and there connected to an arm 92 in the path .of'a float 93 within the casing 86.

Leading from the end ofithe nipple 88 remote from the casing 86 1s a pipe 94 leading into the interior of the casing 33 through the" bottom thereof.

Connected to the casing 83 at any convenlent point 1s another pipe 95 includin a i valve 96 andconnected to a coupling 9 in a pipe 98 leading to and entering the casing 1 near the bottom thereof ,'by wayofi a pipe rated portion 100 arranged to discharge into the interior oi the casing 1. Connected to the topof the casing 86 is a pipe 101 leading through connected check valves 102, 103 to the pipe 98. The check valves 102 and 103 may. be of the same construction as the check valve 29.

Within the chambers and associated and connected with the casing 86 isa charm her 104- provided for the purpose of freezmg small quantities of ice for table Purposes.

On starting-up the apparatu, a suitahle quantity of ammonia water of requisite strength is placed within the casing 1, the casing or chamber 33 being assumed to be empt position. Under these circumstances the gas valve! is open and, as the safety valve 6 is always open except under abnormal conditions, gas fiows to the burner 3 and is ignited by the pilot flame issuing from the burner 4. The water control valve 65 is also open and the cooling coil 13 of the generator-absorber is consequently .cut out from the water rculating system. The thermostatically controlled water-supply valve 37, is ofcourse closed at the outset-of this operation, but as soon as the ammonia liquid in the-generatorabsorher is heated to say 150 F. -which is very soon after thegas is turned on'the valve 37 is opened and the water circulation established." ""That ortion of the ammonia Water within the 0011s 8 and 10 is heated by the gas fiame, thereby settin up a circula tion which ultimately heats a l the liquid 16,

with the float 39in the lowermost drivingofi ammonia gas therefrom; which.

gas may and usually does include more or less watery vapor. The ammonia gas rises in that portion of the casing -1 above the liquid containing portion, and striking the defiectors 17 and fll passing through the coils 18 is .cooled su ciently to condense the watery vapors, so that thev'drop back into the liquid containing portion of the casing 1. The anhydrous ammonia gas now leaves the casing 1' by way of the pipe26 and 28 and checkvalves 27 and29 and enters the coil 23 "inclosed in the sheathing 24 where the pipe or coil 23 is subjected to the cooling action of waterflovving'through the duct 25. The ammonia gas is thereby cooled and flows in liquid form into the chamber 33 Where it accumulates until in sufficient quantity. to

.raise the float 39 to an extent causing-1t to rock the arm 48 sufficiently to close the valve 7, and thus shut oil the supply of gas to the burner 3, and at the same time to close the valve '65 and thus include the cooling coil13 of the generator-absorber in the Water circu lating system.

This chills the water 16 in the absorption tank orachamber creatin vacuum onsubat-v mospher c conditions t er'cin. The condensed and liquefied ammonia flows from the accuses casing 33, constituting the receiving" charm her, by way oi" the pipe as to the expansion chamber Within the casing 84% where it ultimately raises the float 93 sullicient-ly to permit the valve 89 to close, and further permitting --such accumulation of liquid ammonia in the receiving chamber 33 to cause the cutting off. of gas and the accumulation of liquefied ammonia in the receivingcham her 33 to set up the conditions already named. When the water in the absorption chamber becomes suiiiclently cool and'subatmospheric conditions are established in the casing 1,

such subatmospherio conditions also become established in the casing or chamber 86, whereupon the liquefied ammonia therein evaporates and expands, and by such evaporation chills the chamber 85 and all parts in refrigerating communication with the chamber. The evaporated ammonia naturally flows toward the absorption chamber and in'theform of a. gas enters the water 16 through the perfdrations 100 of the pipe 99, being thus distributed through the water 16 so as to be absorbed thereby. Ultimately the accumulated supply of liquefied ammonia becomes exhausted to a suliicient extent to cause the dropping of the float 39 far enough to return the arm 48 to the first position, thereby opening the valve 65 and thus shutting off he flow of water through the coil 13 a and at the same time opening the gas valve the cooling 7. When. the water 16 becomes cool after the shutting oil of the gas supply and the extinguishing of the flame at the burner 3, of the liquid 16 so reduces the temperature at the thermostat 73 that the a predetermined limit, say, .200 pounds, per

valve 37 becomes closed and the flow of cool-v ing water through the coils 34: and 18 and 25 ceases, there then being no reason for a continuance of the flow of cooling water. 7

in actual practice with an apparatus in which the depth of the liquid'lG as represented in the drawings was about fourteen inches, the process of distillation takes from twenty-fire to thirty minutes, while the C001" i g -the weak liquor in the absorption chamber by water flowing through the coil 13 requires but two or three minutedtime when the pressure in the absorption chamber represented within the casing 1 is below that of the expansion chamber 86. The float 93 and. valve 89 maintain a constant level of ammoniain the chamber 86, thus drawing ammonia from the supply within the cham ber 33 only as rapidly as the ammonia expands in the chamber 86. The evaporation man apparatus like that described and of the size intimated is accomplished in about sinteculiours, when the weighted arm at? is tipped back to the first position and the cycle 0t operations is repeated.

Should the pressure in the casing 1 exceed square inch, the valve 6 is automatically closed and the supply of gas is cut oil", the valve remaining positively closed thereafter until again opened by hand. The distilling process is so short that frost formed on the, chamber 86 does not melt, the rise in temperature being only from one and one half to three degrees F. .The various parts subjected to pressure are all made to withstand the highest pressure with an ample margin of safety.

T he pressure. which it has been found necessary to maintain in order to bring about the liquefaction of the ammonia gas and the temperature to which it is necessary to raise the rich liquor during the distilling period varies in accordance with atmospheric temperatures. It may be necessary during hot weather, and when the cooling water is naturally higher than at other times, to em-v ploy a condensing pressure of from 170 to, 175 pounds, and to raise the temperature of the rich liquor during the distilling period to about 263. These amounts, however, varv in accordance with conditions. 1

The valve 96 is normally closed, but is provided for the purpose of draining the expansion tank of ammonia s sary or desirable.

No attempt hasbeen made to Show any heat insulating material, but it will be understood that such material may be can plojved wherever it may be needed.

This application is a continuation in part of my application No. 75,374 for a refrigerating apparatus filed January 31, 1916.

la ing described my improvements and hould it be necesthe best way now lmown to me of carrying the same into practical effect, I state in conclusion, that I do not limit myself to the structural details hereinbeiore' described and shown in the accompanying drawings in illustration of my invention since manifestly the same can be considerably varied.without departure from the spirit of my invenmeans for the cooling means and for the heating means, thermo-responsive means in 'the absorption chamber for controlling the flow of cooling medium in. the cooling means for chilling the distilled ammonia gas, and means responsive to the level of accumulated other cooling means in the path of the gas liquid ammonia in the collecting chamber for controlling the supply of heating medium to-the heating means and the flow of cooling medium through. the cooling means in the absorption chamber.

2. In a refrigerating apparatus, an ab scrption chamber for containing ammonia water and provided with a continuation tor receiving ammonia gas evaporated from the ammonia Water, heating means for causing the evaporation of the. gas from the ammonia Water, means for supplying fuel to the -distilled gas, said controlling means bethe heating means, 'ehilling means in the gasreceiving part of the absorption chamber, a collecting chamber for liquefied ammonia,

from the-absorption chamber to the collecting chamber. and means for controlling the heating medium flowing to the heating means and the coolinq'medium for chilling 1 ing associated with the collecting chamber and responsive to variations in level of liquefied ammonia gas in said collecting chamber. V

3. In a 'refrigeration apparatus, anabsorption means comprising a casing with a cooling coil therein, means for heating liquid Within the casing. baflies in the casing in the path of gas distilled from the liquid,

and other cooling coils interspersed with the baffles.

4. In a refrigerating apparatus, an upright casing having heating means associated therewith separate cooling coilsgin the upper and lower portions of the casing, and battles in the upper part of the casing.

In a refrigerating apparatus, an uprightcasing having heating means at the I means in the upper portion of' the casing,

and coolingmeans exterior to the casing and including means for-conveying gas from the casing, said last-named cooling means being located above the casing.

' 7. A refrigerating apparatus comprising i an absorption and distilling means. cooling means for the absorption portion of the anparatus, other cooling means for the distiltarmac late, means responsive to pro-determined temperature conditions in the absorption portion of the apparatus for oontrollin cooling means for the distillate to con cuss the, distillate into liquid form, and means responsive to accumulations of liquefied distillate to control the cooling means ofthe absorption portion of the apparatus.

8. A. refrigerating apparatus of them termittent aborption type comprising agenerator-abscrber; means for conden sing the ammonia gas generated Pthereby; a receiver for,,the liquefied ammonia from said condenser; a burner and gas su ply therefor for. heating the generator-absor er;a water cir-j culating system for cooling, the ammonia condensing means; a cooling coil in the liquid containing portien'of'the generatorabs orber included in a lay-pass from the cooling Water circulating system; and means responsive to variations in the level of the ammonia liquid in the receiver for turning on or oil the gas supply and simultaneously therewith throwing the by-pass including the cooling coil in the generator-absorber out of, or into, circuit with the cooling water circulating system, according as the generator absorber is acting as a generator or as an absorber substantially as hcreinbefore set forth.

9. In combination with the elements specificd in the last preceding claim, thcrmqstatically controlled means, responsive to variations in the temperature ofthe liquill in the generator-absorber for automatically cutting oli the water supply from the cool ing water circulating system whenever and ,so long as the temperature of the liquid in the generator-absorber falls below a predetermined l'imit, substantially as and for the purposes hereinbefore set forth.

10. In combination with 'the generatorabsorber, the burner for heating the same, and the gas supply pipe for said burner; a valve on said pipe for turning on and off the gas supply; thcrmostatically-controlled means responsive to variations in temperature within the generator-absorber and 0p crating to close said valve when said temperature exceeds a predetermined limit; and means whereby the valve, when once closed. is automaticallylocked in that position until released by hand, substantially as hereinbcfore set forth.

In-testimony, tlht I claim the foregoing as my own, I have hereto aflixed my signature in the presence of two witnesses.

OTTO E. BORNHAUSER. Witnesses:

SARAH HO'L'I'EMOTH, WM. '1. Fmsmonn. 

